Designers of robotics and automation solutions are often faced with a choice: cycloid or planetary gears? In the last few decades, the answer has often been cycloidal drives. But the planetary gears have caught up and are now superior in many ways. The Hamelin company Schaeffler Ultra Precision Drives (previously Melior Motion) has revolutionized the planetary gear and with its PSC series, produces extremely precise, quiet and durable drive units.